The transportation system need to transport waste away from cells to the excretory tissue. Why?
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Answer:
Unlike unicellular organisms, multicellular cells are not in direct contact with the outside environment. Therefore, diffusion simply cannot meet their oxygen requirements. Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not.
Explanation:
Answer:
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circulatory system
The circulatory system delivers oxygen and nutrients to cells and takes away wastes.
We need a transport system to deliver oxygen, nutrients and other substances to all our body cells, and take away waste products from them. ... The deoxygenated blood returns to the heart from the body in the vena cava (a vein), the heart pumps is to the lungs to get rid of the carbon dioxide.
Explanation:
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